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NOAA/NWS STORM PREDICTION CENTER REPORTS + U.S. CENSUS DATA

Hail, Wind & Tornado Reports in Contra Costa County, CA

Public hail, wind, and tornado reports across Contra Costa County, CA from April 29, 1983 through February 18, 2026, sourced from NOAA/NWS Local Storm Reports and SPC storm report data.

Example: 94513 — search hail, wind and tornado public reports for any U.S. ZIP code 
Hail Reports
2
Wind Reports
10
Tornado Reports
5
Max Hail Size
0.75″
Source  NOAA SPC · NWS Local Storm Reports Coverage  Contra Costa County, CA · 1983–present Updated  Daily · last Feb 18, 2026

Latest NWS Hail Reports in Contra Costa County

2 reports
Free hail report for your home →
0.75″ hail
Apr 29, 1983
5:30 PM CST
Hail report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: Not provided, CA
0.75″ hail
Apr 29, 1983
4:00 PM CST
Hail report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: Not provided, CA
Showing 2 of 2
Hail Damage Risk for Your Home +

Hail reports describe hail by diameter, often comparing stone size to familiar objects like peas, quarters, golf balls, and softballs. Use this guide as a starting point for possible hail damage to your roof, siding, gutters, vents, windows, and exterior. Actual hail damage depends on hail hardness, density, wind speed, impact angle, roof age, shingle condition, roof pitch, roofing material, installation quality, and prior storm damage.

Pea
0.25″
Low

Usually too small to cause hail damage to most sound asphalt roofs, siding, or gutters.

Mothball
0.50″
Sub-Severe Watch

Below the NWS severe-hail threshold, but not always harmless. Repeated small hail can scuff surfaces, wear aging shingles, and loosen protective granules over time.

Penny
0.75″
Minor / Watch

Below the NWS severe-hail threshold, but roof hail damage is still possible on older, brittle, poorly installed, or previously damaged shingles. May also mark screens, vents, gutters, and soft metal.

Nickel
0.88″
Minor / Watch

Still below the severe-hail threshold, but large enough to leave visible marks on soft metal and add wear to older or hail-weakened roof shingles.

Quarter
1.00″
Watch

The NWS severe-hail threshold. Quarter-size hail can bruise shingles, dent soft metal, and create roof hail damage worth checking.

Half Dollar
1.25″
Watch

More likely to dent gutters, vents, flashing, and siding. Hail damage risk rises quickly on older roofs or hail-weakened shingles.

Ping Pong / Walnut
1.50″
Likely

Hail damage becomes more likely, including bruised shingles, granule loss, dented siding, and damaged roof vents.

Golf Ball
1.75″
Likely

Often causes roof hail damage, cracked shingles, dented gutters, damaged flashing, and siding impacts. A roof inspection is recommended.

Hen Egg
2.00″
Serious

Can crack or puncture shingles, expose mat, dent siding, and cause widespread hail damage across the roof and exterior.

Tennis Ball
2.50″
Serious

Can cause heavy roof hail damage, punctured siding, broken skylights, damaged vents, and widespread exterior damage.

Baseball
2.75″
Major

Major hail damage is likely, including severe roof impacts, damaged siding, broken windows, and possible major roof repairs.

Tea Cup / Large Apple
3.00″
Major

Can cause heavy hail damage across the roof, siding, gutters, windows, and exterior. Significant repairs are often needed.

Softball
4.00″
Extreme

Destructive hail damage. Can severely damage roofing materials, siding, windows, gutters, vents, vehicles, and exterior surfaces.

Grapefruit
4.50″
Extreme

Catastrophic hail damage risk for roofs, windows, vehicles, siding, gutters, and exterior surfaces.

Source: NOAA / National Weather Service hail size references are used for hail-size comparisons and the 1.00″ severe-hail threshold. Damage descriptions are general homeowner guidance, not official NOAA/NWS damage ratings. Sub-severe hail under 1.00″ is below the severe threshold, but that does not mean “no roof damage.” Penny- to nickel-size hail can still contribute to granule loss, cosmetic surface marks, and added wear, especially on older, brittle, poorly installed, or previously damaged roofs.

Latest NWS Wind Reports in Contra Costa County

10 reports
Free hail report + wind check →
UNK mph
Feb 18, 2026
4:55 AM UTC
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: Tree down blocking the right lane of northbound San Pablo Avenue at the oil refinery.
NWS Wind Report Location: 1 W Rodeo, CA
UNK mph
Dec 25, 2025
2:01 PM UTC
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: Tree blocking the slow lane of the San Pablo Avenue onramp to eastbound California Highway 4.
NWS Wind Report Location: 3 SW Rodeo, CA
UNK mph
Dec 14, 2024
6:05 PM UTC
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: Report from mPING: 1-inch tree limbs broken; Shingles blown off damage category.
NWS Wind Report Location: 1 NW Martinez, CA
UNK mph
Apr 5, 2024
11:12 PM UTC
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: CHP reported tree down in roadway along Danville Blvd. Time estimated via radar.
NWS Wind Report Location: 2 S Walnut Creek, CA
UNK mph
Apr 5, 2024
11:06 PM UTC
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: CHP reported powerlines down near Walnut Creek along Boulevard Way.
NWS Wind Report Location: 2 WSW Walnut Creek, CA
UNK mph
Mar 21, 2023
11:38 PM UTC
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
NWS Wind Report Location: 2 NW Alamo, CA
UNK mph
Jan 10, 2023
4:37 PM UTC
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: POWER LINES HANGING LOW OVER ROAD.
NWS Wind Report Location: El Sobrante, CA
UNK mph
Nov 27, 2017
9:31 AM UTC
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: MORE THAN 2000 ELECTRIC CUSTOMERS WITHOUT POWER IN BLACKHAWK.
NWS Wind Report Location: Blackhawk, CA
UNK mph
Feb 1, 2016
12:38 AM UTC
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: TOPPLED TRAFFIC SIGN IN THE NUMBER 1 LANE OF THE CON
NWS Wind Report Location: 2 E Antioch, CA
UNK mph
Feb 7, 1994
12:40 PM PST
Wind report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Wind Report Description: Severe weather developed in the cold air behind the first of two Pacific storm systems to hit California. The severe thunderstorm produced wind gusts of 64 mph at the Air Force base.
NWS Wind Report Location: Vandenberg Air Force, CA
Showing 10 of 10
Wind Damage Risk for Your Home +

Storm reports list thunderstorm wind gusts in mph. The NWS marks storms as severe at 58+ mph, but wind damage to your home depends on roof age, shingle condition, installation, exposure, nearby trees, and prior hail or wind damage.

Below Severe
Under 58 mph
Minor

Usually little damage to a sound roof, but loose shingles, flashing, or debris may shift.

Severe
58–74 mph
Watch

Can loosen shingles, lift flashing, break limbs, and damage gutters, siding, fences, or trim.

Damaging
75–90 mph
Serious

Can peel shingles, damage vents, tear siding, rip gutters, and expose weak roof areas.

Extreme
90+ mph
Major

Can cause major roof covering loss, tree damage, broken windows, and structural damage.

Source: NOAA / National Weather Service storm reports. Gusts may be measured or estimated; actual wind damage varies by roof condition, exposure, and prior hail or wind damage.

Latest NWS Tornado Reports in Contra Costa County

5 reports
EF1 category
Jan 23, 2010
12:54 PM PST-8
Tornado report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Tornado Report Description: A low topped super cell produced an EF0 tornado near Brentwood. The tornado crossed power lines and destroyed a utility pole (DI24, DOD4). An eyewitness described the tornado as high winds from swirling white cloud. The pole was twisted to the ground and the top one-third of the 40-foot pole was splintered. Fifty-five customers lost power at 12:54 p.m. PST.
NWS Tornado Report Location: 3.77 WSW Brentwood, CA
F0 category
Dec 5, 1998
7:30 PM PST
Tornado report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Tornado Report Description: No National Weather Service description provided.
NWS Tornado Report Location: Richmond, CA
F0 category
Feb 19, 1998
12:30 PM PST
Tornado report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Tornado Report Description: Weak tornado demolished a 120' by 40' shade structure at a nursery as well as a chicken coop nad a tool shed.
NWS Tornado Report Location: Brentwood, CA
F0 category
Sep 18, 1989
5:10 PM PST
Tornado report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Tornado Report Description: No National Weather Service description provided.
NWS Tornado Report Location: Not provided, CA
F0 category
Sep 18, 1989
5:10 PM CST
Tornado report for Contra Costa County, CA
Contra Costa County · 287,782 Homes in County
Tornado Report Description: No National Weather Service description provided.
NWS Tornado Report Location: Not provided, CA
Showing 5 of 5
Tornado Damage Risk for Your Home +

After a tornado, the National Weather Service assigns an EF rating from EF0 to EF5 based on surveyed damage. The rating estimates wind speed from what the tornado damaged, so actual damage can vary by construction quality, roof age, garage doors, windows, trees, debris, and how close the home was to the tornado path.

EF0
65–85 mph
Light

Can peel shingles, damage gutters or siding, break tree limbs, and toss loose outdoor items.

EF1
86–110 mph
Moderate

Can strip roof covering, damage exterior doors, break windows, snap trees, and cause heavier siding or gutter damage.

EF2
111–135 mph
Serious

Can tear off large sections of roofing, break or uproot trees, destroy weaker structures, and cause major exterior damage.

EF3–EF5
136+ mph
Severe

Can remove roofs and walls, destroy large portions of homes, toss vehicles, and cause severe to total destruction near the path.

Source: NOAA / National Weather Service. EF ratings are assigned after a post-storm damage survey and are based on observed damage, not a direct measurement at every home.

NWS Hail, Wind and Tornado Reports in Contra Costa County on the Interactive Map

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Wind
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Browse Cities with NWS Storm Reports in Contra Costa County

Brentwood, CA 4
Hail, wind & tornado reports
Concord, CA 2
Hail, wind & tornado reports
Rodeo, CA 2
Hail, wind & tornado reports
Walnut Creek, CA 2
Hail, wind & tornado reports
Alamo, CA 1
Hail, wind & tornado reports
Antioch, CA 1
Hail, wind & tornado reports
Blackhawk, CA 1
Hail, wind & tornado reports
El Sobrante, CA 1
Hail, wind & tornado reports
Martinez, CA 1
Hail, wind & tornado reports
Richmond, CA 1
Hail, wind & tornado reports

NWS Storm Reports & Census Data

U.S. Census Data · County

Contra Costa County, CA area census snapshot

People & households
Population1,161,458
Households411,662
Housing units426,585
Income
Median household income$125,727
$100k+ households41.8%
$150k+ households21.7%
Housing stock
Single-family detached287,782
Attached single-family37,026
Small multifamily39,886
Large multifamily55,231
Mobile homes6,213
Housing mix
Single-family share67.5%
Attached-home share8.7%
Multifamily share22.3%
Mobile-home share1.5%
Ownership & occupancy
Owner-occupied278,509
Renter-occupied133,153
Vacant units14,923
Home value & age
Median home value$830,800
Owner homes $300k+94.2%
Owner homes $500k+84.3%
Owner homes $750k+56.4%
Median year built1978
Older-home share53.8%
Vehicle context
Households with cars390,702
Free hail maps

This snapshot is for local area context only and describes the selected state, county, city, or ZIP area — not a specific home or property. For ZIP-level estimated hail impact, use Free Hail Maps to generate a hail report with key impact details for that ZIP.

Top ZIP Codes with NWS Storm Reports in Contra Costa County

94513 4
Brentwood, CA Hail, wind & tornado reports
94518 2
Concord, CA Hail, wind & tornado reports
94611 2
Oakland, CA Hail, wind & tornado reports
94505 1
Discovery Bay, CA Hail, wind & tornado reports
94506 1
Blackhawk, CA Hail, wind & tornado reports
94507 1
Alamo, CA Hail, wind & tornado reports
94531 1
Antioch, CA Hail, wind & tornado reports
94547 1
Hercules, CA Hail, wind & tornado reports
94553 1
Martinez, CA Hail, wind & tornado reports
94572 1
Rodeo, CA Hail, wind & tornado reports
94595 1
Walnut Creek, CA Hail, wind & tornado reports
94596 1
Walnut Creek, CA Hail, wind & tornado reports
94803 1
Richmond, CA Hail, wind & tornado reports
94804 1
Richmond, CA Hail, wind & tornado reports
95219 1
Stockton, CA Hail, wind & tornado reports

Get a Remote Hail Inspection

Not sure if hail may have affected your home in Contra Costa County? Ask a local pro for a Remote Hail Inspection. They can review hail activity for your property and help you decide whether an in-person roof or exterior inspection makes sense.

Frequently asked questions

for homeowners, buyers & sellers
How many hail, wind, and tornado reports does Contra Costa County have on record?

Our records show 2 hail, 10 wind, and 5 tornado reports in Contra Costa County, compiled from NOAA SPC and NWS Local Storm Reports. The most recent was reported on February 18, 2026.

What is the largest hail ever reported in Contra Costa County?

The largest hail size in these storm-report records in Contra Costa County is 0.75″. It was reported near Brentwood, CA on April 29, 1983.

A storm report showed up near my home in Contra Costa County — does that mean my roof is damaged?

Not necessarily. A storm report only means hail, wind, or a tornado was observed nearby; it does not confirm damage at any specific address, and conditions change from block to block. Check an address-level hail report first, and if it looks significant, find a local pro that serves Contra Costa County and ask about a Remote Hail Inspection before anyone climbs on the roof.

I am buying a home in Contra Costa County — why should I look at its storm history?

Recent hail or wind can leave a roof or exterior with damage that is easy to miss during a walkthrough, and a recent roof replacement is sometimes an insurance job after a storm. Reviewing the storm history for a Contra Costa County address before closing helps you ask informed questions about roof age, past repairs, and any prior claims.

I am selling a home in Contra Costa County — how does this help me?

Knowing the storm history for your address lets you answer buyer questions with confidence, document repairs you have already made, and decide whether a pre-listing roof check is worthwhile. A clear hail history removes a common sticking point during negotiations.

How do I check hail history for a specific Contra Costa County address?

Use the address search to pull a free address-level hail report for any property in Contra Costa County — no phone number or email required. It shows recent hail activity for that address so you know whether a closer roof or exterior review makes sense.

Where does this storm report data come from, and what are its limits?

Storm reports on this page are public reports from storm events across Contra Costa County, CA, sourced from NOAA SPC and NWS Local Storm Reports. They show where hail, wind, or tornado activity was reported in Contra Costa County, but they do not confirm damage at any specific property. Report locations, sizes, and times may be approximate and can vary from what an individual home experienced. For property-specific hail history, use an address-level hail report or contact a participating local professional for a remote hail inspection. Pros inclusion is not an endorsement, and contacting a professional does not confirm damage at any property.

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